There was a good radio 4 programme where the scammers can purchase a telephone number and use it from anywhere in the world, such web sites apparently exist, the scammer can purchase any number such as those beginning with 01 / 020 / 0140 / 01563 Etc.
The scammer then uses this number that appears to be a UK based number so there is more chance of it being picked up.
The other really worrying thing that is going on with the UK telephone system is that you get a scam call, you inadvertently answer it, then you hang up, but the scammer does not hang up he stays on the line? upshot is that the scammer can eaves drop on your next outgoing call, or it you are calling your bank, the scammer or one of his accomplices answer so because you have called the number for your bank, but you are now talking to the scammers who have this particular scam down tight, your details will over time be obtained and your account drained.
There is a very good radio 4 [again, sorry about that] programme where a family installed a remote recording device that recorded the entire scam being perpetrated on a vulnerable older lady using the system generally as above.
Another scam was reported on [yet again Radio 4 last week] sorry about that, where a scammer called a victim and demanded money to keep the telephone line open stating that the bill had not been paid for the line, the scammer threatened to cut the connection at which point the victim hung up, when the victim tried to call out the phone line was dead, the victim thought that the line had been cut. A short while later the scammer re-called the victim was provided with full bank details and guess what, the account was cleared totally.
How was it done, seriously dead simple, when the phone was put down by the victim the scammer pressed the "Mute" on the handset which had the effect of apparently indicating to the victim that the scammer could and did cut the phone line when the victim used the phone again, what happens then is that the scammer calls back, obtains the bank details and hew presto an empty bank account.
Serious problem then occurs the victim goes to his / her bank to report a scam, BUT, the victim gave his / her details to the scammer, some banks would walk away and refuse a refund, because the victim gave away all the details on a voluntary basis? ? ?
Ken